EP 0093342 A1 19831109 - Copolyamide acid and copolyimide.
Title (en)
Copolyamide acid and copolyimide.
Title (de)
Copolyamidsäure und Copolyimid.
Title (fr)
Copolyamide-acide et copolyimide.
Publication
Application
Priority
JP 6914582 A 19820424
Abstract (en)
[origin: JPS58185624A] PURPOSE:A copolymic acid having extremely high heat resistance, elasticity and strength and a novel structure; and a polyimide film therefrom having a high modulus of elasticity and a high strength. CONSTITUTION:A copolyamic acid comprising repeating units represented by formulas a and B, wherein the molar ratio of A/B is 20:80-80:20, and the logarithmic viscosity is 0.5dl/g-10dl/g when measured at a temperature of 30 deg.C at a concentration of 0.5g/dl in an N,N-dimethylformamide solution. A copolyimide comprising repeating units represented by formulas C and D, wherein the molar ratio of C/D is 20:80-80:20. This copolyimide has a logarithmic viscosity of 0.5dl/g-10dl/g when measured in a 97% concentrated sulfuric acid at a temperature of 30 deg.C and a concentration of 0.5g/dl.
IPC 1-7
IPC 8 full level
C08G 69/00 (2006.01); C08G 69/32 (2006.01); C08G 73/00 (2006.01); C08G 73/10 (2006.01)
CPC (source: EP US)
C08G 73/1042 (2013.01 - EP US); C08G 73/1067 (2013.01 - EP US); C08G 73/1071 (2013.01 - EP US)
Citation (search report)
- [Y] US 3424718 A 19690128 - ANGELO RUDOLPH J
- [Y] ENCYCLOPEDIA OF POLYMER SCIENCE AND TECHNOLOGY, vol. 11, 1969, pages 247-257, John Wiley and Sons
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0093342 A1 19831109; EP 0093342 B1 19861105; DE 3367401 D1 19861211; JP H0366332 B2 19911017; JP S58185624 A 19831029; US 4438256 A 19840320
DOCDB simple family (application)
EP 83103925 A 19830421; DE 3367401 T 19830421; JP 6914582 A 19820424; US 48241783 A 19830406